Check your programming first to see if the radios match perfectly. Here is a link to the user guide: http://www.giantintl.com/ContentManage/manuals/Moto/FV300%2001-11-08.pdf
Next, check the battery pack in the radio that is not transmitting. A low or bad battery can prevent a radio from transmitting, as it takes more power to transmit than to receive.
Lastly, check the mic hole to see if it is covered or has debris.
Best regards.
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